SB Acoustics SB16PFCR25-4-COAX Coaxial Woofer

The SB16PFCR25-4-COAX from SB Acoustics is a meticulously engineered 6.5-inch coaxial woofer that delivers deep, controlled bass while integrating a full-range driver for a remarkably space-efficient solution. This driver is ideal for high-fidelity audio systems where cabinet volume is at a premium, such as in custom car audio builds, compact home theatre subwoofers, or two-way satellite speakers. Its coaxial design ensures a single-point sound source, improving phase coherence and imaging, making it a superb choice for discerning listeners who demand both low-end extension and clear midrange reproduction.

Technically, this woofer features a robust plastic basket and a paper cone from the acclaimed PFC Paper series, known for its natural sound character. With a nominal impedance of 4 ohms and a DC resistance of 3.2 ohms, it is amplifier-friendly. The driver boasts a sensitivity of 90 dB (SPL 1m/2.83V) and a linear excursion (Xmax) of 9.3 mm, enabling significant air displacement for impactful bass. Its low total Q (Qts) of 0.31 and low voice coil inductance (Le) of 0.31 mH ensure tight, controlled performance, while the mechanical (Qms 2.6) and electrical (Qes 0.35) Q factors contribute to precise damping. The cut-out diameter is 144.5 mm, with a mounting depth of 88.3 mm, facilitating straightforward installation. This coaxial woofer represents an excellent balance of compact form and authoritative low-frequency output.